You should be talking to a lender. There are many qualified lenders who would be able to help you put a plan together and from the sound of it you are thinking of buying an investment property. A well qualified, old school lender will be able to help you find a way or program that will work for you.
DON'T(!) go trying to do something like this with out an experience professional to back you up. Don't want to go through hall that effort to find a property then realize your loan plans are not going to work.
No, I've lived there for four years. Every summer there seems to be a cluster of for sale signs that was slowely moving closer. It started in the Adams Morgan/Mt.P areas and has slowley moved over. This area will still be refered to as Columbia Heights or Petworth depending on where you're looking. I've rarley heard this neighborhood name.
It looks like 11th street is set to become a nice locally-focus business strip. We already have Red Rocks, Columbia Heights Coffees, Wonderland, El Riconcito, 11th Street Deli, Acuario's, etc.
That said, be prepared to become somewhat active in your community. We have block cleanups, neighborhood pub crawls, and game nights. There is a lot of older people on their front steps just watching the world go by. Take every chance to get to know these people. They have so much knowledge of history and a wonderful perspective on DC.... more